Electrode potential stability is a major challenge for solid-contact ion-selective electrodes (SC-ISEs), with the formation of a water layer in the ion-to-electron transducer being the main cause of electrode potential instability. To investigate this problem, hydrophilic polyaniline (PANI) nanofibers doped with H₃PO₄ (PANI-H₃PO₄, water contact angle (CA) 48°) and highly hydrophobic polyaniline nanofibers doped with perfluorooctanoic acid (PANI-PFOA, CA 120°) were prepared by electrochemical deposition and secondary doping, then used as the solid contact layer in the construction of Pb²⁺-ISEs. By studying the potential response of the fabricated Pb²⁺-ISEs to Pb²⁺ ions using chronopotentiometry and water layer tests as a function time, it was determined that Pb²⁺-ISEs containing hydrophobic PANI-PFOA as the solid contact layer offered superior stability potential and a longer life. The potential drift of the developed GC/PANI-PFOA/Pb²⁺-ISM electrode was only 21.62 ± 4 μV/h, while the potential drift of GC/PANI-PFOA/Pb²⁺-ISM electrode was 197.6 ± 16 μV/h, highlighting the benefits of a strongly hydrophobic SC layer in SC-ISEs construction.

电极电位稳定性是固体接触离子选择性电极 (SC-ISE) 的主要挑战，在离子-电子换能器中形成水层是电极电位不稳定的主要原因。为了研究这个问题，亲水性聚苯胺 (PANI) 纳米纤维掺杂 H ₃ PO ₄ (PANI-H ₃ PO ₄，水接触角 (CA) 48°) 和高度疏水性聚苯胺纳米纤维掺杂全氟辛酸 (PANI-PFOA, CA 120 °) 通过电化学沉积和二次掺杂制备，然后用作构建 Pb ²⁺ -ISE 中的固体接触层。通过研究制备的 Pb ²⁺ -ISE 对 Pb ²⁺的潜在响应使用计时电位法和水层测试作为函数时间的离子，确定含有疏水性 PANI-PFOA 作为固体接触层的Pb ²⁺ -ISE 具有优异的稳定性潜力和更长的寿命。开发的 GC/PANI-PFOA/Pb ²⁺ -ISM 电极的电位漂移仅为 21.62 ± 4 μV/h，而 GC/PANI-PFOA/Pb ²⁺ -ISM 电极的电位漂移为 197.6 ± 16 μV/ h，突出了 SC-ISE 构建中强疏水性 SC 层的好处。